In a protein molecule, the number of amino acid molecules may be as few as 5
5.000
500
50

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate